I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
weirder warder wordier wiredraw wiredrew wartier
birder girder weirder ruder gridder harder hardier herder hoarder braider curdier larder warder broidery lowrider nerdier parader sirdar tardier torrider wordier joyrider forrader corder murder guarder lardier ridder horrider raider boarder cruder carder broider arider rider order reorder derider tireder trader grader border yarder
weird weirdie weirdo weirdy wired